The equilibrium phase relations of molten Si–Fe, Si–Ni, and Si–Fe–Cr alloys saturated with either silicon carbide (SiC) or graphite, which are candidates for the solvent for rapid solution growth of SiC, have been investigated. The measured carbon solubilities at 2073 K were 0.19–6.6 mol% for the Si–(24.1–70.1) mol% Fe, 0.061–5.2 mol% for Si–(30.0–85.0) mol% Ni, and 1.1–3.9 mol% for Si–(50−x) mol% Fe–x mol% Cr (x = 10.4–40.1) alloys. A quasi-chemical model that assumes that the carbon atoms are introduced into the interstitial sites of the Si–Fe, Si–Ni, and Si–Fe–Cr solvents and obstruct the bonding between solvent atoms was used to evaluate the activity coefficient of carbon in each alloy. The estimation reproduced the trends of the measured carbon solubilities fairly well. However, the estimation using the sub-regular solution model often overestimated the carbon solubilities. Thus, the carbon behavior in molten silicon–transition metal alloys is well described by the quasi-chemical model.

已经研究了饱和碳化硅（SiC）或石墨的熔融Si–Fe，Si–Ni和Si–Fe–Cr合金的平衡相关系，它们是SiC快速溶液生长的溶剂候选者。对于Si–（24.1–70.1）mol％Fe，在2073 K下测得的碳溶解度为0.19–6.6 mol％，Si–（30.0–85.0）mol％Ni为0.061–5.2 mol％，对于Si–（30.0–85.0）mol％Ni为1.1–3.9 mol％。 Si–（50- x）mol％Fe– x mol％Cr（x= 10.4–40.1）合金。假设碳原子被引入Si-Fe，Si-Ni和Si-Fe-Cr溶剂的间隙位置并阻碍溶剂原子之间的键合的准化学模型用于评估碳的活度系数在每种合金中。该估计相当好地再现了测得的碳溶解度的趋势。但是，使用次规则解模型进行的估算经常高估了碳的溶解度。因此，准化学模型很好地描述了熔融硅-过渡金属合金中的碳行为。